Demi Lovato performing during her summer concert tour at the Greek Theatre in Los Angeles. Lovato, actress Zooey Deschanel from "New Girl," and Matthew Morrison of "Glee" are stepping up to the plate to perform at the World Series between the Detroit Tigers and San Francisco Giants. Morrison will sing the national anthem before Game 2 on Oct. 25, Deschanel before Game 3 on Oct. 27, and Lovato before Game 4 on Oct. 28. (Photo by John Shearer/Invision/AP, file)